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Craig DTurkey Red coupons with the "Base Ball series will be ready to mail April 1, 1910" show a 1-75 checklist on the back and measure approx 2 1/2" X 4". The Fez coupon with the same front and back info (1-75 checklist, start and finish date) measures approx 2 1/4" X 2 1/2". The Turkey Red coupons showing the 1-76 checklist measure the same as the 1-75 back but do not state a beginning date, only the ending date of June 30, 1911. Lastly, I have an Old Mill coupon which has the 77-126 checklist. It measures the same as the Fez and again, only mentions the offer expiration date of June 30, 1911.
Turkey Red obviously started in 1910 and went through half of 1911, actually making it a 1910-1911 issue. I thought this was fairly common knowledge, but maybe not.
As a last note, I have very rarely seen the 77-126 checklist coupons.